Process for producing a coating film and process for producing a solid polymer electrolyte fuel cell

Abstract

A process for producing a coating film consisting of a single coating layer or a plurality of coating layers laminated, which comprises a coating operation of relatively moving at least one of a die for discharging a coating liquid containing short fibrous fillers from a linear opening with a predetermined length and a substrate for coating, on which the coating liquid discharged from the die is coated, to form a coating layer on the substrate for coating, wherein the direction in the coating operation includes at least two different angle directions with regard to the single coating layer or the plurality of coating layers of the coating film.

What is claimed is:  
     
       1. A process for producing a coating film consisting of a single coating layer or a plurality of coating layers laminated, which comprises a coating operation of relatively moving at least one of a die for discharging a coating liquid containing short fibrous fillers from a linear opening with a predetermined length and a substrate for coating, on which the coating liquid discharged from the die is coated, to form a coating layer on the substrate for coating, 
       wherein the direction in the coating operation includes at least two different angle directions with regard to the single coating layer or the plurality of coating layers of the coating film.  
     
     
       2. The process for producing a coating film according to  claim 1 , wherein the short fibrous fillers comprise a fibrillated fluorocarbon polymer. 
     
     
       3. The process for producing a coating film according to  claim 1 , wherein the coating operation is a composite operation comprising a feeding operation in one direction along one line and a reciprocating operation in a direction at right angles to the line of the feeding operation. 
     
     
       4. The process for producing a coating film according to  claim 3 , wherein the direction in the feeding operation is a direction at right angles to the longitudinal direction of the linear opening of the die, and the direction in the reciprocating operation is the longitudinal direction of the linear opening of the die. 
     
     
       5. The process for producing a coating film according to  claim 3 , wherein the direction in the feeding operation is the longitudinal direction of the linear opening of the die, and the direction in the reciprocating operation is a direction at right angles to the longitudinal direction of the linear opening of the die. 
     
     
       6. The process for producing a coating film according to  claim 3 , wherein the short fibrous fillers comprise a fibrillated fluorocarbon polymer. 
     
     
       7. The process for producing a coating film according to  claim 1 , wherein the coating film has at least two coating layers, in any two coating layers, each of the directions in the coating operations for forming the upper side coating layer and the lower side coating layer is at right angles to the longitudinal direction of the linear opening of the die, and after formation of the lower side coating layer, the direction of at least one of the die and the substrate for coating is changed to form the upper side coating layer so that the directions of the coating operations for the lower side coating layer and the upper side coating layer are at right angles to each other. 
     
     
       8. The process for producing a coating film according to  claim 7 , wherein the short fibrous fillers comprise a fibrillated fluorocarbon polymer. 
     
     
       9. A process for producing an electrolyte membrane for solid polymer electrolyte fuel cells comprising a reinforced ion exchange membrane, which comprises forming a coating layer on a substrate for coating by a coating operation of relatively moving at least one of a die for discharging a coating liquid containing short fibrous fillers and an ion exchange resin from a linear opening with a predetermined length and the substrate for coating, on which the coating liquid discharged from the die is coated, to form an ion exchange membrane consisting of a single coating layer or a plurality of coating layers laminated, 
       wherein the direction in the coating operation includes at least two different angle directions with regard to the single coating layer or the plurality of coating layers of the ion exchange membrane.  
     
     
       10. The process for producing an electrolyte membrane for solid polymer electrolyte fuel cells according to  claim 9 , wherein the short fibrous fillers comprise a fibrillated fluorocarbon polymer. 
     
     
       11. The process for producing an electrolyte membrane for solid polymer electrolyte fuel cells according to  claim 9 , wherein the coating operation is a composite operation consisting of a feeding operation in one direction along one line and a reciprocating operation in a direction at right angles to the line of the feeding operation. 
     
     
       12. The process for producing an electrolyte membrane for solid polymer electrolyte fuel cells according to  claim 11 , wherein the direction in the feeding operation is a direction at right angles to the longitudinal direction of the linear opening of the die, and the direction in the reciprocating operation is the longitudinal direction of the linear opening of the die. 
     
     
       13. The process for producing an electrolyte membrane for solid polymer electrolyte fuel cells according to  claim 11 , wherein the direction in the feeding operation is the longitudinal direction of the linear opening of the die, and the direction in the reciprocating operation is a direction at right angles to the longitudinal direction of the linear opening of the die. 
     
     
       14. The process for producing an electrolyte membrane for solid polymer electrolyte fuel cells according to  claim 11 , wherein the short fibrous fillers comprise a fibrillated fluorocarbon polymer. 
     
     
       15. The process for producing an electrolyte membrane for solid polymer electrolyte fuel cells according to  claim 11 , wherein the ion exchange membrane has at least two coating layers, in any two coating layers, each of the directions in the coating operations for forming the upper side coating layer and the lower side coating layer is at right angles to the longitudinal direction of the linear opening of the die, and after formation of the lower side coating layer, the direction of at least one of the die and the substrate for coating is changed to form the upper side coating layer so that the directions of the coating operations for the lower side coating layer and the upper side coating layer are at right angles to each other. 
     
     
       16. The process for producing an electrolyte membrane for solid polymer electrolyte fuel cells according to  claim 15 , wherein the short fibrous fillers comprise a fibrillated fluorocarbon polymer. 
     
     
       17. A process for producing a solid polymer electrolyte fuel cell comprising a polymer electrolyte membrane, and an anode and a cathode facing each other with the polymer electrolyte membrane interposed therebetween, which comprises forming a coating layer on a substrate for coating by a coating operation of relatively moving at least one of a die for discharging a coating liquid containing short fibrous fillers and an ion exchange resin from a linear opening with a predetermined length and the substrate for coating, on which the coating liquid discharged from the die is coated, to form an ion exchange membrane consisting of a single coating layer or a plurality of coating layers laminated, and disposing the ion exchange membrane as a polymer electrolyte membrane between an anode and a cathode, 
       wherein the direction in the coating operation includes at least two different angle directions with regard to the single coating layer or the plurality of coating layers of the ion exchange membrane.  
     
     
       18. The process for producing a solid polymer electrolyte fuel cell according to  claim 17 , wherein the short fibrous fillers comprise a fibrillated fluorocarbon polymer. 
     
     
       19. The process for producing a solid polymer electrolyte fuel cell according to  claim 17 , wherein the coating operation is a composite operation consisting of a feeding operation in one direction along one line and a reciprocating operation in a direction at right angles to the line of the feeding operation. 
     
     
       20. The process for producing a solid polymer electrolyte fuel cell according to  claim 19 , wherein the direction in the feeding operation is a direction at right angles to the longitudinal direction of the linear opening of the die, and the direction in the reciprocating operation is the longitudinal direction of the linear opening of the die. 
     
     
       21. The process for producing a solid polymer electrolyte fuel cell according to  claim 19 , wherein the direction in the feeding operation is the longitudinal direction of the linear opening of the die, and the direction in the reciprocating operation is a direction at right angles to the longitudinal direction of the linear opening of the die. 
     
     
       22. The process for producing a solid polymer electrolyte fuel cell according to  claim 19 , wherein the short fibrous fillers comprise a fibrillated fluorocarbon polymer. 
     
     
       23. The process for producing a solid polymer electrolyte fuel cell according to  claim 17 , wherein the ion exchange membrane has at least two coating layers, in any two coating layers, each of the directions in the coating operations for forming the upper side coating layer and the lower side coating layer is at right angles to the longitudinal direction of the linear opening of the die, and after formation of the lower side coating layer, the direction of at least one of the die and the substrate for coating is changed to form the upper side coating layer so that the directions of the coating operations for the lower side coating layer and the upper side coating layer are at right angles to each other. 
     
     
       24. The process for producing a solid polymer electrolyte fuel cell according to  claim 23 , wherein the short fibrous fillers comprise a fibrillated fluorocarbon polymer.